Semiclassical transport theory based on the Boltzmann equation predicts Kohler's rule \(\Delta \rho /\rho \) (0) = \(F[H/\rho (0)]\)  to hold if there is a single type of charge carrier and scattering time in a metal.[1]} Violation of Kohler's rule is common in XMR materials, such as LaBi, TaAs, TaAs\(_2\) , NbAs\(_2\) , NbSb\(_2\) .[2]}, [3]}, [4]}, [5]} As shown in Fig.2(c), MR in WP\(_2\)  systematically deviates from Kohler's rule above 10 K. The field dependence of MR at different temperature can be well fitted with MR = \(A\)  \(\times \)  \(H^n\) , \(n\)  is 1.8 at 2 K. The exponent \(n\)  systematically decreases to 1.5 with increasing temperature, as shown in Fig.2(d). The temperature evolutions of \(A\)  and \(n\)  are similar to temperature dependence of MR(9T).
